For starters, Steve Carell is the only reason I watched this film, and its the perfect role in which he excels at - as a lovable down-on-his-luck good guy with great punch lines.
Not being a fan of romantic comedies (i'm a guy, after all), I still found myself somewhat impressed with this one, and even fought back tears in one scene (when Steve was telling his three daughters which part of them reminds him of his dead wife). And many of the jokes throughout are brilliant and funny.
What I didn't like about this film was the cheezy family dynamics. Seriously, does ANYONE know a family out there that meets up for a week, get along perfectly (for the most part), exercise together, play football together, and even do special talent shows in front of each other by the fireplace? guitar and all? come on... that's not 'REAL LIFE'.
The plot also was way too predictable. I knew right away things would be awkward, then they'll fall in love, then all hell will break loose in the family, but then everything will work out perfectly and last scene will be a wedding with everyone all happy and perfect. Its about as predictable as a period.
And *despite* all that, I still give it a generous 7 out of 10 because, well Steve Carell is in it, and its NOT Evan Almighty. :)